Synnefo » ./kamaki

There are three types of filters in kamaki cli side:

A. supported by API Request
B. included in API Response
C. custom values set by users

if A is the case,
   the filter must be supported with an (optional) argument, e.g. image list --order=-
elif B is the case,
   kamaki will filter the response against the filter to print only the requested results e.g. image list --name-like='Debian'
elif C, which means that users can set custom metadata, then
   we should follow the naming conventions of each context and add the -key and -value suffices to filter custom metas by key and value
   e.g. in "image" context the custom metas are called "properties". So we have:
      [OK] image list --property=OS=Linux    //Keep only results with OS=Linux
      [OK] image list --property-key=OS      //Keep only results that have an OS=* property
      [NO] image list --property-value=Linux //Keep only results with at least one *=Linux property - WILL NOT BE IMPLEMENTED, seems meaningless for now
fi

If more than one filtering options are present, it results to a JOIN query.

About JOIN:
No elaborate join mechanisms for now. A more effective JOIN (with index) may be a good idea only if we need to filter really large responses. If that's the case, we should plan an optimization for a future version. For now, we should be content with a simple O(N) filtering mechanism.